This would be a substantial change for eastern Syria, as the Syrian government has never authorized US involvement at all, and the US has gone out of their way not to get Syrian approval for strikes.

It also makes sense for Syria, however, to embrace the Shi’ite-dominated Iraqi government’s involvement in fighting ISIS, as it gives the appearance of bringing them into an anti-ISIS alliance that includes Lebanon’s Hezbollah and both Syria and Iran’s governments, along with Shi’ite militias from elsewhere around the world.